54483-84-0Relevant academic research and scientific papers
Total Syntheses of (?)-Strictosidine and Related Indole Alkaloid Glycosides
Ishikawa, Hayato,Rakumitsu, Kenta,Sakamoto, Jukiya,Sumimoto, Michinori,Umeda, Yuhei
supporting information, p. 13414 - 13422 (2020/06/08)
A collective synthesis of glycosylated monoterpenoid indole alkaloids is reported. A highly diastereoselective Pictet–Spengler reaction with α-cyanotryptamine and secologanin tetraacetate as substrates, followed by a reductive decyanation reaction, was developed for the synthesis of (?)-strictosidine, which is an important intermediate in biosynthesis. This two-step chemical method was established as an alternative to the biosynthetically employed strictosidine synthase. Furthermore, after carrying out chemical and computational studies, a transition state for induction of diastereoselectivity in our newly discovered Pictet–Spengler reaction is proposed. Having achieved the first enantioselective total synthesis of (?)-strictosidine in just 10 steps, subsequent bioinspired transformations resulted in the concise total syntheses of (?)-strictosamide, (?)-neonaucleoside A, (?)-cymoside, and (?)-3α-dihydrocadambine.
The synthesis of 3α- and 3β-dihydrocadambine from secologanin
Hamilton, Raymond G.,Saunders, Gavin N.,McLean, Stewart
, p. 284 - 287 (2007/10/02)
Secologanin, protected as the dimethyl acetal of its tetraacetate, had previously been dihydroxylated at the vinyl side chain with high stereoselectivity to provide the glycol (4) of the correct configuration for the synthesis of 3α- and 3β-dihydrocadambine.The glycol was converted to the cyclic acetal 5 to protect the secondary alcohol, the primary alcohol was oxidized to provide the aldehyde 7, and this was reductively coupled with tryptamine.Treatment of the coupled intermediate (8) with 90 percent formic acid followed by deacetylation of the glycoside led to the formation of a mixture of 3α- and 3β-dihydrocadambine (40 percent and 33 percent, respectively).The synthesis confirms the structure assigned to these alkaloids, and establishes the configuration, relative and absolute, at all centres except C-3 (where it provides no new stereochemical information).
A SYNTHESIS OF 3α-DIHYDROCADAMBINE
Saunders, Gavin N.,Hamilton, Raymond G.,McLean, Stewart
, p. 2359 - 2360 (2007/10/02)
3α-Dihydrocadambine has been synthesized from secologanin.
